Associations between genetic variants, epidemiological risk factors and risk of nasopharyngeal carcinoma.

aOR = odds ratio; CI = confidence interval. OR and 95% CI were derived from logistic regression, with adjustment for age, sex, education level, dialect, household type (rural/urban). bOR and 95% CI were derived using logistic regression adjusted for age, sex, education level, dialect, rural or urban household type, and all other variables listed in the table. cP values for trend (two-sided) were derived from Cochran- Armitage trend tests.